Microsoft Security Essentials vulnerability reminds that security risks are everywhere
As is often the case with these flaws, the fact that the attacker has valid credentials is arguably a bigger problem than the vulnerability itself. However, there's an important takeaway: at any time, any program on your computer could be putting you at risk. Even your antivirus or anti-malware app.
It's important (and imperative) to keep your operating system and apps as up-to-date as possible. It also helps to know what other programs you can use to ensure your system is safe. Free Windows programs like Secunia PSI -- which scans your system for vulnerable programs -- and Returnil's System Safe -- which lets you complete roll back changes to your computer, including those made by malware -- can be a big help in locking down your system.